The International Commission on Stratigraphy (ICS), sometimes referred to unofficially as the "International Stratigraphic Commission", is a daughter or major subcommittee
grade scientific daughter organization that concerns itself with stratigraphical
, and geochronological
matters on a global scale.
It is the largest subordinate body of the International Union of Geological Sciences
(IUGS). The ICS is essentially a permanent working subcommittee
, which meets far more regularly than the quadrennial meetings scheduled by the IUGS, when it meets as a congress or membership of the whole
One of its main aims, a project begun in 1974, is to establish a multidisciplinary standard and global geologic time scale
that will ease paleontological
comparisons region to region by benchmarks with stringent and rigorous strata criteria called Global Boundary Stratotype Section and Point
s (GSSPs) within the fossil record. (i.e. section of the rock record
as of a core sample section or accessible exposed strata, which when a core sample are usually "trayed" in long pieces, also called "sections" about a meter in length.)
Additionally the ICS defines an alternative type of benchmark and criteria called Global Standard Stratigraphic Age
s (GSSAs) where the characteristics and dating criteria set solely by physical sciences
methods (such as magnetic alignment sequences, radiological criteria, etcetera.) as well as encouraging an international and open debate amongst Earth scientists
in the paleontology
fields, among others.
The International Commission on Stratigraphy has spawned numerous subcommittee
level organizations organized and mobilized on a local country-wide or regional basis that are the true working committees of the IUGS, and these do the field work, basis comparisons in conference or co-ordination research committee
meetings of local or wide-scale scope.
The ICS publishes various reports and findings as well as revised references periodically, summarized in the International Stratigraphic Chart, a combined ''working proposal'' and ''guideline-to-date'' released after the last ICS deliberations prior to the upcoming (next) meeting of the IUGS. Until the IUGS accepts the recommendations, they are unofficial since the IUGS parent approves or dismisses the individual deliberation reports of the ICS, which are presented as recommendations, and span dating and strata selection criteria, and related issues including nomenclatures. In ''de facto
'' everyday matters, the deliberative results reported out of any meetings of the ICS are widely accepted and immediately enter everyday use, except in the rare cases where they result in a strong body of dissenting opinion, which matters are resolved before the full IUGS.
One such controversy arose in 2009 when the ICS deliberated and decided that the Pliocene Series
of the current but unofficially named Quaternary Period
should be shifted into the Neogene System
and Neogene Period.
Despite the strong debate, the Quaternary saw official ratification as a geological unit from the IUGS in June 2009, placing its lower boundary to the Gelasian
Stage/Age at Monte San Nicola, Sicily, Italy (until then uppermost part of the Pliocene
Series/Epoch, and thus of the Neogene
System/Period), 2.58 Ma BP
In addition to publishing paper and document (PDF) versions of the International Stratigraphic Chart, the ICS also provides a machine-readable version of the chart formulated using the Web Ontology Language (OWL)
and, in particularTime Ontology in OWL
The ICSchart web page
also provides an interactive version of the chart, based on the OWL data.
The logo of International Commission on Stratigraphy was designed after the Chinese character of "mountain", 山.
Category:International scientific organizations
Category:International Union of Geological Sciences
Category:Scientific organizations established in 1974